There is a GROOVY Foot for That! Long before we had sewing machines capable of multitudes of fancy stitches, and before the innovations we have seen in the century, sewers for eons have added creative details to dress up their fabrications.
Couching is simply sewing a heavy thread in place with a finer thread. Its a retro technique, too, that was originally done by hand, but it works beautifully by machine as well. I use a zigzag stitch to secure the heavy thread in place.
Sewing Tutorial ~ Sewing Machine Feet: The Edge-Stitch Foot. Ever wonder how sewists get perfect topstitching? The secret is to use an Edge Stitch Foot. Learn all about the secrets to this amazing presser foot.